Re: Headlights
Most any headlight can be, if not perfected, at least really, really improved with a thorough cleaning and re-conditioning of the lens using the well-documented method of wet-sanding with increasing grits of sandpaper (800, 1000, 1200, 1300, 1500) and polishing with plastic-specific compound.
The cleaning methods are in the "Sticky" section of "Lighting", I think.